Talk:Anthian City - Shopping District/@comment-30610595-20170301031333/@comment-26120508-20170421015341

Since you can only Mega Evolve one Pokemon per battle, the other five have wasted item slots (since the Mega stone they hold becomes utterly useless).

Pick only one Mega, so you can give good items to your other Pokemon (Life Orb, Leftovers, Weakness Policy, just to name a few).